<template>
  <div>
    <!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!--    卡片视图区域-->
    <el-card>
      <!--      警告框-->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!--      选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--      选择商品分类的级联选择框-->
          <!--          <el-cascader-->
          <!--            :options="cateList"-->
          <!--            :props="cateProps"-->
          <!--            @change="handleChange">-->
          <!--          </el-cascader>-->
          <el-cascader-panel
            :options="cateList"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange"
          >
          </el-cascader-panel>
        </el-col>
      </el-row>
      <!--    tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!--          动态参数表格-->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <!--            展开列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleAttrClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!--            索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作" width="180">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="
                    showEditDialog(scope.row.attr_id, scope.row.attr_name)
                  "
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!--          静态属性表格-->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <!--            展开列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleAttrClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!--            索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称">
            </el-table-column>
            <el-table-column label="操作" width="180">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="
                    showEditDialog(scope.row.attr_id, scope.row.attr_name)
                  "
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
      <!--      添加参数/属性对话框-->
      <el-dialog
        :title="'添加' + addTitle"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
      >
        <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
        >
          <el-form-item :label="addTitle" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!--      修改参数/属性对话框-->
      <el-dialog
        :title="'修改' + addTitle"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
      >
        <el-form
          :model="editForm"
          :rules="editFormRules"
          ref="editFormRef"
          label-width="100px"
        >
          <el-form-item :label="addTitle" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      cateList: [],
      // 级联选择框双向数据绑定数组
      selectedCateKeys: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      editForm: {
        attr_name: '',
        attr_id: ''
      },
      // 表单校验规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入名称', trigger: 'blur' }]
      },
      editFormRules: {
        attr_name: [{ required: true, message: '请输入名称', trigger: 'blur' }]
      }
    }
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败！')
      }
      // 将获取到的商品列表数据保存到data中
      this.cateList = res.data
    },
    handleChange () {
      this.getParamsData()
    },
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    async getParamsData () {
      console.log(this.selectedCateKeys)
      // 证明选中的是 三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
      } else {
        // 根据所选的 分类id 和 tab面板 发送请求获取数据
        const { data: res } = await this.$http.get(
          `categories/${this.cartId}/attributes`,
          {
            params: {
              sel: this.activeName
            }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败!')
        }
        // console.log(res.data)
        res.data.forEach(item => {
          // item.attr_vals不为空进行分割，为空 赋值为空数组
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          item.inputVisible = false
          item.inputValue = ''
        })
        // console.log(res.data)
        if (this.activeName === 'many') {
          // 动态参数的数据
          this.manyTableData = res.data
        } else {
          // 静态属性的数据
          this.onlyTableData = res.data
        }
        console.log(res.data)
      }
    },
    // 监听 添加参数/属性对话框 的关闭事件
    addDialogClosed () {
      // 重置表单
      this.$refs.addFormRef.resetFields()
    },
    editDialogClosed () {
      // 重置表单
      this.$refs.editFormRef.resetFields()
    },
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 校验通过发起添加参数/属性 的请求
        const { data: res } = await this.$http.post(
          `categories/${this.cartId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加失败！')
        }
        this.$message.success('添加成功！')
        this.addDialogVisible = false
        await this.getParamsData()
      })
    },
    showEditDialog (id, name) {
      this.editForm.attr_id = id
      this.editForm.attr_name = name
      this.editDialogVisible = true
    },
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 发起编辑参数的请求
        const { data: res } = await this.$http.put(
          `categories/${this.cartId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改失败！')
        }
        this.$message.success('修改成功！')
        this.editDialogVisible = false
        await this.getParamsData()
      })
    },
    // 删除属性/参数
    removeParams (id) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(async () => {
          const { data: res } = await this.$http.delete(
            `categories/${this.cartId}/attributes/${id}`
          )
          // console.log(res)
          if (res.meta.status !== 200) {
            return this.$message.error('删除失败！')
          }
          this.$message.success('删除成功！')
          await this.getParamsData()
        })
        .catch(err => {
          console.log(err)
          this.$message.info('取消了删除')
        })
    },
    // 对 attr_vals 进行操作 保存到数据库中
    async saveAttrVals (row) {
      // 发起请求，保存当前操作
      const { data: res } = await this.$http.put(
        `categories/${this.cartId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('更新失败！')
      }
      this.$message.success('更新成功！')
    },
    handleInputConfirm (row) {
      if (row.inputValue) {
        row.attr_vals.push(row.inputValue.trim())
        this.saveAttrVals(row)
        // await this.getParamsData()
      }
      row.inputVisible = false
      row.inputValue = ''
    },
    showInput (row) {
      row.inputVisible = true
      // $nextTick 方法的作用
      // 当页面上的元素被重新渲染后 才会执行函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleAttrClosed (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    isBtnDisabled () {
      // 如果按钮被禁用则 返回true
      return this.selectedCateKeys.length !== 3
    },
    // 获取三级分类的id
    cartId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    addTitle () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-cascader-panel {
  width: 100px;
  height: 200px;
}
.el-tag {
  margin: 0 5px;
}
.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin-left: 10px;
  vertical-align: bottom;
}
</style>
